https://www.graalvm.org/ 
public abstract class com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode extends com.oracle.truffle.js.nodes.access.FrameSlotNode implements com.oracle.truffle.js.nodes.RepeatableNode, com.oracle.truffle.js.nodes.ReadNode
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode
  super_class: com.oracle.truffle.js.nodes.access.FrameSlotNode
{
  void <init>(com.oracle.truffle.api.frame.FrameSlot);
    descriptor: (Lcom/oracle/truffle/api/frame/FrameSlot;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode this
        start local 1 // com.oracle.truffle.api.frame.FrameSlot slot
         0: .line 68
            aload 0 /* this */
            aload 1 /* slot */
            invokespecial com.oracle.truffle.js.nodes.access.FrameSlotNode.<init>:(Lcom/oracle/truffle/api/frame/FrameSlot;)V
         1: .line 69
            return
        end local 1 // com.oracle.truffle.api.frame.FrameSlot slot
        end local 0 // com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/oracle/truffle/js/nodes/access/JSReadFrameSlotNode;
            0    2     1  slot  Lcom/oracle/truffle/api/frame/FrameSlot;
    MethodParameters:
      Name  Flags
      slot  

  public static com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode create(com.oracle.truffle.api.frame.FrameSlot, com.oracle.truffle.js.nodes.access.ScopeFrameNode, boolean);
    descriptor: (Lcom/oracle/truffle/api/frame/FrameSlot;Lcom/oracle/truffle/js/nodes/access/ScopeFrameNode;Z)Lcom/oracle/truffle/js/nodes/access/JSReadFrameSlotNode;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 73
            new java.lang.Error
            dup
            ldc "Unresolved compilation problems: \n\tJSReadScopeFrameSlotWithTDZNodeGen cannot be resolved\n\tJSReadScopeFrameSlotNodeGen cannot be resolved\n"
            invokespecial java.lang.Error.<init>:(Ljava/lang/String;)V
            athrow
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    MethodParameters:
                     Name  Flags
      slot                 
      levelFrameNode       
      hasTemporalDeadZone  

  public static com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode create(com.oracle.truffle.api.frame.FrameSlot, int, int, com.oracle.truffle.api.frame.FrameSlot[], boolean);
    descriptor: (Lcom/oracle/truffle/api/frame/FrameSlot;II[Lcom/oracle/truffle/api/frame/FrameSlot;Z)Lcom/oracle/truffle/js/nodes/access/JSReadFrameSlotNode;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=5, args_size=5
         0: .line 81
            new java.lang.Error
            dup
            ldc "Unresolved compilation problem: \n\tJSReadCurrentFrameSlotNodeGen cannot be resolved\n"
            invokespecial java.lang.Error.<init>:(Ljava/lang/String;)V
            athrow
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    MethodParameters:
                     Name  Flags
      slot                 
      frameLevel           
      scopeLevel           
      parentSlots          
      hasTemporalDeadZone  

  public static com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode create(com.oracle.truffle.api.frame.FrameSlot);
    descriptor: (Lcom/oracle/truffle/api/frame/FrameSlot;)Lcom/oracle/truffle/js/nodes/access/JSReadFrameSlotNode;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=1, args_size=1
         0: .line 88
            new java.lang.Error
            dup
            ldc "Unresolved compilation problems: \n\tJSReadScopeFrameSlotWithTDZNodeGen cannot be resolved\n\tJSReadCurrentFrameSlotNodeGen cannot be resolved\n"
            invokespecial java.lang.Error.<init>:(Ljava/lang/String;)V
            athrow
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    MethodParameters:
      Name  Flags
      slot  

  public boolean hasTag(java.lang.Class<? extends com.oracle.truffle.api.instrumentation.Tag>);
    descriptor: (Ljava/lang/Class;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode this
        start local 1 // java.lang.Class tag
         0: .line 96
            aload 1 /* tag */
            ldc Lcom/oracle/truffle/js/nodes/instrumentation/JSTags$ReadVariableTag;
            if_acmpeq 1
            aload 1 /* tag */
            ldc Lcom/oracle/truffle/api/instrumentation/StandardTags$ReadVariableTag;
            if_acmpne 4
         1: .line 97
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode.frameSlot:Lcom/oracle/truffle/api/frame/FrameSlot;
            invokestatic com.oracle.truffle.js.runtime.JSFrameUtil.isInternal:(Lcom/oracle/truffle/api/frame/FrameSlot;)Z
            ifeq 3
         2: .line 99
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode.frameSlot:Lcom/oracle/truffle/api/frame/FrameSlot;
            invokestatic com.oracle.truffle.js.runtime.JSFrameUtil.isThisSlot:(Lcom/oracle/truffle/api/frame/FrameSlot;)Z
            ireturn
         3: .line 101
      StackMap locals:
      StackMap stack:
            iconst_1
            ireturn
         4: .line 103
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 1 /* tag */
            invokespecial com.oracle.truffle.js.nodes.access.FrameSlotNode.hasTag:(Ljava/lang/Class;)Z
            ireturn
        end local 1 // java.lang.Class tag
        end local 0 // com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lcom/oracle/truffle/js/nodes/access/JSReadFrameSlotNode;
            0    5     1   tag  Ljava/lang/Class<+Lcom/oracle/truffle/api/instrumentation/Tag;>;
    Signature: (Ljava/lang/Class<+Lcom/oracle/truffle/api/instrumentation/Tag;>;)Z
    MethodParameters:
      Name  Flags
      tag   

  public java.lang.Object getNodeObject();
    descriptor: ()Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=1
        start local 0 // com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode this
         0: .line 109
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode.frameSlot:Lcom/oracle/truffle/api/frame/FrameSlot;
            invokestatic com.oracle.truffle.js.runtime.JSFrameUtil.getPublicName:(Lcom/oracle/truffle/api/frame/FrameSlot;)Ljava/lang/String;
            astore 1 /* name */
        start local 1 // java.lang.String name
         1: .line 110
            ldc "name"
            aload 1 /* name */
            invokestatic com.oracle.truffle.js.nodes.instrumentation.JSTags.createNodeObjectDescriptor:(Ljava/lang/String;Ljava/lang/Object;)Lcom/oracle/truffle/js/nodes/instrumentation/NodeObjectDescriptor;
            astore 2 /* descriptor */
        start local 2 // com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptor descriptor
         2: .line 111
            aload 2 /* descriptor */
            ldc "readVariableName"
            aload 1 /* name */
            invokevirtual com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptor.addProperty:(Ljava/lang/String;Ljava/lang/Object;)V
         3: .line 112
            aload 2 /* descriptor */
            areturn
        end local 2 // com.oracle.truffle.js.nodes.instrumentation.NodeObjectDescriptor descriptor
        end local 1 // java.lang.String name
        end local 0 // com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    4     0        this  Lcom/oracle/truffle/js/nodes/access/JSReadFrameSlotNode;
            1    4     1        name  Ljava/lang/String;
            2    4     2  descriptor  Lcom/oracle/truffle/js/nodes/instrumentation/NodeObjectDescriptor;

  public java.lang.String expressionToString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode this
         0: .line 117
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode.frameSlot:Lcom/oracle/truffle/api/frame/FrameSlot;
            invokevirtual com.oracle.truffle.api.frame.FrameSlot.getIdentifier:()Ljava/lang/Object;
            instanceof java.lang.String
            ifeq 2
         1: .line 118
            aload 0 /* this */
            getfield com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode.frameSlot:Lcom/oracle/truffle/api/frame/FrameSlot;
            invokevirtual com.oracle.truffle.api.frame.FrameSlot.getIdentifier:()Ljava/lang/Object;
            checkcast java.lang.String
            areturn
         2: .line 120
      StackMap locals:
      StackMap stack:
            aconst_null
            areturn
        end local 0 // com.oracle.truffle.js.nodes.access.JSReadFrameSlotNode this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lcom/oracle/truffle/js/nodes/access/JSReadFrameSlotNode;
}
SourceFile: "JSReadFrameSlotNode.java"
InnerClasses:
  public final ReadVariableTag = com.oracle.truffle.api.instrumentation.StandardTags$ReadVariableTag of com.oracle.truffle.api.instrumentation.StandardTags
  public final ReadVariableTag = com.oracle.truffle.js.nodes.instrumentation.JSTags$ReadVariableTag of com.oracle.truffle.js.nodes.instrumentation.JSTags
    RuntimeInvisibleAnnotations: 
      com.oracle.truffle.api.dsl.ImportStatic(value = {Lcom/oracle/truffle/api/frame/FrameSlotKind;})